5) Mark Zuckerberg (Age: 30; Net worth: $33.4 billion)

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Mark Zuckerberg is the founder and CEO of Facebook. The social media giant’s revenue grew 58 percent in 2014 to $12.5 billion, supported by a spurt in mobile ads. Zuckerberg is working on turning virtual reality headset maker Oculus VR, for which he paid $2 billion in 2014, into a next generation computing platform.

4) Dustin Moskovitz (Age: 30; Net worth: $7.9 billion)

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Dustin was the third employee of Facebook. He helped kick start the social media behemoth with roommate Zuckerberg from their Harvard dorm. Moskovitz is eight days younger than Zuckerberg.

3) Julio Mario Santo Domingo III (Age: 29; Net worth: $2.2 billion)

This New York City disk jockey is one of the four heirs to his namesake grandfather’s Colombian beer fortune. Julio Mario Santo Domingo left one-sixth of his wealth to his grandson.